Most laws are meant to promote the general welfare or protect society from an evil. Did Jim Crow laws serve these purposes? If so, how? If not, what was their purpose?

Jim Crows laws did not serve any of those purposes. Jim Crow laws enforced racial segregation in education, housing, transportation, and public facilities. Its purpose was to basically create a second class and maintain white supremacy.

Explanation:

an expansion is one of two basic business cycle phases; the other is contraction. the transition from expansion to contraction is a peak, and the changeover from contraction to expansion is a trough.

the answer is a) to be able to obey them.